Polaris C18

Polaris C18 Guard  Columns from Agilent Technologies

Choosing to use guard columns can help reduce operating expenses, by reducing the frequency of analytical column replacement. The guard column prevents damage caused by particulate matter and strongly adsorbed material. To maintain an adequate capacity for sample impurities, choose a guard column with an internal diameter similar to the column internal diameter. Ideally, the packing of the guard column should be the same as the analytical column so that the chromatography of the analytical column is not altered.

Polaris C18-A is the best starting place for separations where the benefits of polar-modified columns are desired. The polar modifications of C18-A help it avoid poor peak shape and retention issues in low organic conditions. Polaris C18-A columns offer alternate selectivity for general polar applications and are designed with hydrogen-bond accepting endcapping.

Polaris C18-Ether columns are endcapped with an ether group to create a more polar surface for selectivity variation. 

Polaris Amide-C18 columns provide subtle alternative selectivity because they do not have steric protection. They utilize an embedded amide, similar to Bonus-RP columns.